Derivatives galore. Don't forget you might need to split the function because of the absolute value.
Here’s one.
Matt was gifted $200 from his parents for his birthday. His friend gave him $100. How much money does Matt have now?
200+100=300
Matt has $300.
<span>B.) Opportunity cost</span>
I'm not completely sure, but I think you have to add up the numbers and subtract by two.